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// shunt - interface resolution
//
// Turns a configured interface name into its device and gateways from a
// netifd dump. Explicit config values always win.
//
// SPDX-License-Identifier: GPL-3.0-or-later
// Copyright (c) 2026 Dirk Brenken <dev@brenken.org>
function nexthop(entry, fam) {
let dflt = (fam == 4) ? '0.0.0.0' : '::';
for (let r in (entry?.route ?? []))
if (r?.target == dflt && r?.mask == 0 && length(r?.nexthop ?? ''))
return r.nexthop;
return null;
}
export function resolve(policies, dump) {
let entries = dump?.interface ?? [];
let out = [];
for (let p in (policies ?? [])) {
let device = null;
for (let e in entries) {
if (e?.interface == p?.interface && length(e?.l3_device ?? '')) {
device = e.l3_device;
break;
}
}
if (device == null)
for (let e in entries)
if (e?.l3_device == p?.interface) {
device = p.interface;
break;
}
if (device == null) {
push(out, p);
continue;
}
let gw4 = null, gw6 = null;
for (let e in entries) {
if (e?.l3_device != device)
continue;
gw4 ??= nexthop(e, 4);
gw6 ??= nexthop(e, 6);
}
push(out, {
...p,
interface: device,
gw4: p.gw4 ?? gw4,
gw6: p.gw6 ?? gw6
});
}
return out;
};
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